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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff9a0f2008ee49a182d432aea76be61f43bf531c9116f05fc8c35e2c29382e8' 
  AND token = 'mECoc+LltjKNeUWWhaxCeXmTVRCeS+RHeZsTEYvn3rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}